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Reproductive patterns among twins - a Swedish register study of men and women born 1973-1983

BACKGROUND: During the last decades there has been a steady increase of twin births. A combination of improved medical treatment of preterm and small-for-gestational age children has contributed to a higher number of surviving twins. Prematurity is known to affect reproduction in a negative way. Few...

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Autores principales: Bladh, Marie, Josefsson, Ann, Carstensen, John, Finnström, Orvar, Sydsjö, Gunilla
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3551722/
https://www.ncbi.nlm.nih.gov/pubmed/23324566
http://dx.doi.org/10.1186/1471-2393-13-6
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author Bladh, Marie
Josefsson, Ann
Carstensen, John
Finnström, Orvar
Sydsjö, Gunilla
author_facet Bladh, Marie
Josefsson, Ann
Carstensen, John
Finnström, Orvar
Sydsjö, Gunilla
author_sort Bladh, Marie
collection PubMed
description BACKGROUND: During the last decades there has been a steady increase of twin births. A combination of improved medical treatment of preterm and small-for-gestational age children has contributed to a higher number of surviving twins. Prematurity is known to affect reproduction in a negative way. Few studies have focused on the potential effect twinning may have on future reproduction. Thus, the aim of this study was to investigate the effect of being born a twin compared to being born a singleton have on future reproduction. METHODS: In a national population-based register study, all individuals born between 1973–1983 who were alive and living in Sweden at 13 years of age (n = 1 016 908) constituted the sample. Data on each study subject’s own birth as well as the birth of their first offspring, and parental socio-demographic factors were collected from Swedish population based registers. Hazard ratios and corresponding 95% CI was calculated using Cox proportional hazards model. RESULTS: Twins, both men and women, had a reduced likelihood of reproducing compared to singletons (women: HR = 0.89, 95% CI = 0.86-0.93; men: HR = 0.92, 95% CI = 0.87-0.97). This difference in birth rates can only partly be explained by diverging birth characteristics. Amongst men and women born very preterm, twins had an increased likelihood of reproducing compared to singletons (women: HR = 1.25, 95% CI = 1.02-1.62; men: HR = 1.34, 95% CI = 1.01-1.78). CONCLUSIONS: Twins have lower reproduction rates compared to singletons, which only to a certain degree can be explained by diverging birth characteristics.
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spelling pubmed-35517222013-01-24 Reproductive patterns among twins - a Swedish register study of men and women born 1973-1983 Bladh, Marie Josefsson, Ann Carstensen, John Finnström, Orvar Sydsjö, Gunilla BMC Pregnancy Childbirth Research Article BACKGROUND: During the last decades there has been a steady increase of twin births. A combination of improved medical treatment of preterm and small-for-gestational age children has contributed to a higher number of surviving twins. Prematurity is known to affect reproduction in a negative way. Few studies have focused on the potential effect twinning may have on future reproduction. Thus, the aim of this study was to investigate the effect of being born a twin compared to being born a singleton have on future reproduction. METHODS: In a national population-based register study, all individuals born between 1973–1983 who were alive and living in Sweden at 13 years of age (n = 1 016 908) constituted the sample. Data on each study subject’s own birth as well as the birth of their first offspring, and parental socio-demographic factors were collected from Swedish population based registers. Hazard ratios and corresponding 95% CI was calculated using Cox proportional hazards model. RESULTS: Twins, both men and women, had a reduced likelihood of reproducing compared to singletons (women: HR = 0.89, 95% CI = 0.86-0.93; men: HR = 0.92, 95% CI = 0.87-0.97). This difference in birth rates can only partly be explained by diverging birth characteristics. Amongst men and women born very preterm, twins had an increased likelihood of reproducing compared to singletons (women: HR = 1.25, 95% CI = 1.02-1.62; men: HR = 1.34, 95% CI = 1.01-1.78). CONCLUSIONS: Twins have lower reproduction rates compared to singletons, which only to a certain degree can be explained by diverging birth characteristics. BioMed Central 2013-01-16 /pmc/articles/PMC3551722/ /pubmed/23324566 http://dx.doi.org/10.1186/1471-2393-13-6 Text en Copyright ©2013 Bladh et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Bladh, Marie
Josefsson, Ann
Carstensen, John
Finnström, Orvar
Sydsjö, Gunilla
Reproductive patterns among twins - a Swedish register study of men and women born 1973-1983
title Reproductive patterns among twins - a Swedish register study of men and women born 1973-1983
title_full Reproductive patterns among twins - a Swedish register study of men and women born 1973-1983
title_fullStr Reproductive patterns among twins - a Swedish register study of men and women born 1973-1983
title_full_unstemmed Reproductive patterns among twins - a Swedish register study of men and women born 1973-1983
title_short Reproductive patterns among twins - a Swedish register study of men and women born 1973-1983
title_sort reproductive patterns among twins - a swedish register study of men and women born 1973-1983
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3551722/
https://www.ncbi.nlm.nih.gov/pubmed/23324566
http://dx.doi.org/10.1186/1471-2393-13-6
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